package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {
    //并没有交给spring容器来管理，因此需要手动重写
    private StringRedisTemplate stringRedisTemplate;
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//        //1.获取session
//        HttpSession session = request.getSession();
//        //2.获取session中的用户信息
//        Object user = session.getAttribute("user");
//        //3.判断用户是否存在
//        if (user == null) {
//            //4.用户不存在，拦截,返回状态码401
//            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
//            return false;
//        }
        //获取请求头中的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)) {
//            //不存在，拦截，返回401状态码
//            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return true;
        }
        //基于token获取redis中的用户
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);
        if (userMap == null) {
//            //不存在拦截
//            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return true;
        }
        //将hashmap变回DTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //5.存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
        //刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY+token,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        //6.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户，避免内存泄漏，面试重点
        UserHolder.removeUser();
    }
}
